How and where to use guide
VELUX Twin and Combination Flashings 55x118cm EKW CK06 S0122
Typical applications
These flashings are designed for pitched roof installations where skylights, roof vents or chimneys penetrate the roof surface. The 55 x 118cm size accommodates standard domestic roof applications. The flashing works on both timber and concrete roof constructions, making it suitable for a wide range of pitched roof types commonly found in UK residential properties.
- Skylights and roof windows
- Roof ventilation pipes and ducts
- Chimney stacks
- Other roof penetrations on pitched roofs
Installation and fixings
Installation should be carried out in line with VELUX manufacturer guidance and current best practice standards. The flashing must be properly secured to the roof structure using appropriate fixings suitable for your roof type. On timber roofs, fixings should penetrate into solid timber; on concrete roofs, use fixings designed for concrete substrates. Ensure the flashing sits correctly around the penetration and that all edges are sealed to prevent water ingress. Experienced DIY users can undertake installation, but professional installation is recommended for complex roof configurations.
- Follow VELUX installation instructions precisely
- Use fixings appropriate to your roof surface type
- Ensure flashing sits flush and level around the penetration
- Seal all edges and joints to prevent water entry
- Check fixings are secure before considering the job complete
Weather resistance and maintenance
The flashing finish is engineered to resist fading and cracking, maintaining its protective performance in exposed weather conditions over extended periods. Periodically inspect the flashing and surrounding roof area, particularly after severe weather, to ensure the seal remains intact and no debris has accumulated around the penetration. Clear any moss, leaves or dirt that could trap moisture against the flashing.
- Inspect flashing annually and after severe weather
- Clear debris and moss from around the penetration
- Check that all seals remain intact and watertight
- Address any cracks or damage promptly to prevent water ingress
Limitations and site considerations
This flashing is sized for standard roof applications at 55 x 118cm. Ensure the penetration size and roof pitch are compatible with this flashing size before ordering. Installation should only be undertaken on stable, secure roof structures. Work at height requires appropriate safety precautions, fall protection and scaffolding where necessary. Do not attempt installation in adverse weather conditions or on wet roof surfaces, as this compromises both safety and the quality of the watertight seal.
- Verify penetration size matches flashing dimensions
- Use appropriate fall protection and scaffolding
- Do not install in wet conditions or high winds
- Ensure roof structure is sound and stable before work begins